2 * File...........: linux/drivers/s390/block/dasd_int.h
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
15 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
16 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
17 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
20 * States a dasd device can have:
21 * new: the dasd_device structure is allocated.
22 * known: the discipline for the device is identified.
23 * basic: the device can do basic i/o.
24 * unfmt: the device could not be analyzed (format is unknown).
25 * ready: partition detection is done and the device is can do block io.
26 * online: the device accepts requests from the block device queue.
28 * Things to do for startup state transitions:
29 * new -> known: find discipline for the device and create devfs entries.
30 * known -> basic: request irq line for the device.
31 * basic -> ready: do the initial analysis, e.g. format detection,
32 * do block device setup and detect partitions.
33 * ready -> online: schedule the device tasklet.
34 * Things to do for shutdown state transitions:
35 * online -> ready: just set the new device state.
36 * ready -> basic: flush requests from the block device layer, clear
37 * partition information and reset format information.
38 * basic -> known: terminate all requests and free irq.
39 * known -> new: remove devfs entries and forget discipline.
42 #define DASD_STATE_NEW 0
43 #define DASD_STATE_KNOWN 1
44 #define DASD_STATE_BASIC 2
45 #define DASD_STATE_UNFMT 3
46 #define DASD_STATE_READY 4
47 #define DASD_STATE_ONLINE 5
49 #include <linux/module.h>
50 #include <linux/wait.h>
51 #include <linux/blkdev.h>
52 #include <linux/genhd.h>
53 #include <linux/hdreg.h>
54 #include <linux/interrupt.h>
55 #include <linux/log2.h>
56 #include <asm/ccwdev.h>
57 #include <linux/workqueue.h>
58 #include <asm/debug.h>
60 #include <asm/idals.h>
62 /* DASD discipline magic */
63 #define DASD_ECKD_MAGIC 0xC5C3D2C4
64 #define DASD_DIAG_MAGIC 0xC4C9C1C7
65 #define DASD_FBA_MAGIC 0xC6C2C140
68 * SECTION: Type definitions
73 /* BIT DEFINITIONS FOR SENSE DATA */
74 #define DASD_SENSE_BIT_0 0x80
75 #define DASD_SENSE_BIT_1 0x40
76 #define DASD_SENSE_BIT_2 0x20
77 #define DASD_SENSE_BIT_3 0x10
79 /* BIT DEFINITIONS FOR SIM SENSE */
80 #define DASD_SIM_SENSE 0x0F
81 #define DASD_SIM_MSG_TO_OP 0x03
82 #define DASD_SIM_LOG 0x0C
84 /* lock class for nested cdev lock */
85 #define CDEV_NESTED_FIRST 1
86 #define CDEV_NESTED_SECOND 2
89 * SECTION: MACROs for klogd and s390 debug feature (dbf)
91 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
93 debug_sprintf_event(d_device->debug_area, \
99 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
101 debug_sprintf_exception(d_device->debug_area, \
107 #define DBF_EVENT(d_level, d_str, d_data...)\
109 debug_sprintf_event(dasd_debug_area, \
115 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
117 struct ccw_dev_id __dev_id; \
118 ccw_device_get_id(d_cdev, &__dev_id); \
119 debug_sprintf_event(dasd_debug_area, \
121 "0.%x.%04x " d_str "\n", \
122 __dev_id.ssid, __dev_id.devno, d_data); \
125 #define DBF_EXC(d_level, d_str, d_data...)\
127 debug_sprintf_exception(dasd_debug_area, \
133 /* limit size for an errorstring */
134 #define ERRORLENGTH 30
136 /* definition of dbf debug levels */
137 #define DBF_EMERG 0 /* system is unusable */
138 #define DBF_ALERT 1 /* action must be taken immediately */
139 #define DBF_CRIT 2 /* critical conditions */
140 #define DBF_ERR 3 /* error conditions */
141 #define DBF_WARNING 4 /* warning conditions */
142 #define DBF_NOTICE 5 /* normal but significant condition */
143 #define DBF_INFO 6 /* informational */
144 #define DBF_DEBUG 6 /* debug-level messages */
146 /* messages to be written via klogd and dbf */
147 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
149 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
150 dev_name(&d_device->cdev->dev), d_args); \
151 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
154 #define MESSAGE(d_loglevel,d_string,d_args...)\
156 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
157 DBF_EVENT(DBF_ALERT, d_string, d_args); \
160 /* messages to be written via klogd only */
161 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
163 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
164 dev_name(&d_device->cdev->dev), d_args); \
167 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
169 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
172 struct dasd_ccw_req
{
173 unsigned int magic
; /* Eye catcher */
174 struct list_head devlist
; /* for dasd_device request queue */
175 struct list_head blocklist
; /* for dasd_block request queue */
177 /* Where to execute what... */
178 struct dasd_block
*block
; /* the originating block device */
179 struct dasd_device
*memdev
; /* the device used to allocate this */
180 struct dasd_device
*startdev
; /* device the request is started on */
181 void *cpaddr
; /* address of ccw or tcw */
182 unsigned char cpmode
; /* 0 = cmd mode, 1 = itcw */
183 char status
; /* status of this request */
184 short retries
; /* A retry counter */
185 unsigned long flags
; /* flags of this request */
188 unsigned long starttime
; /* jiffies time of request start */
189 unsigned long expires
; /* expiration period in jiffies */
190 char lpm
; /* logical path mask */
191 void *data
; /* pointer to data area */
193 /* these are important for recovering erroneous requests */
194 int intrc
; /* internal error, e.g. from start_IO */
195 struct irb irb
; /* device status in case of an error */
196 struct dasd_ccw_req
*refers
; /* ERP-chain queueing. */
197 void *function
; /* originating ERP action */
199 /* these are for statistics only */
200 unsigned long long buildclk
; /* TOD-clock of request generation */
201 unsigned long long startclk
; /* TOD-clock of request start */
202 unsigned long long stopclk
; /* TOD-clock of request interrupt */
203 unsigned long long endclk
; /* TOD-clock of request termination */
205 /* Callback that is called after reaching final status. */
206 void (*callback
)(struct dasd_ccw_req
*, void *data
);
211 * dasd_ccw_req -> status can be:
213 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
214 #define DASD_CQR_DONE 0x01 /* request is completed successfully */
215 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
216 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
217 #define DASD_CQR_FAILED 0x04 /* request is finally failed */
218 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
220 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
221 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
222 #define DASD_CQR_ERROR 0x82 /* request is completed with error */
223 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
224 #define DASD_CQR_CLEARED 0x84 /* request was cleared */
225 #define DASD_CQR_SUCCESS 0x85 /* request was successful */
227 /* default expiration time*/
228 #define DASD_EXPIRES 300
229 #define DASD_EXPIRES_MAX 40000000
231 /* per dasd_ccw_req flags */
232 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
233 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
235 /* Signature for error recovery functions. */
236 typedef struct dasd_ccw_req
*(*dasd_erp_fn_t
) (struct dasd_ccw_req
*);
239 * Unique identifier for dasd device.
241 #define UA_NOT_CONFIGURED 0x00
242 #define UA_BASE_DEVICE 0x01
243 #define UA_BASE_PAV_ALIAS 0x02
244 #define UA_HYPER_PAV_ALIAS 0x03
257 * the struct dasd_discipline is
258 * sth like a table of virtual functions, if you think of dasd_eckd
260 * no, currently we are not planning to reimplement the driver in C++
262 struct dasd_discipline
{
263 struct module
*owner
;
264 char ebcname
[8]; /* a name used for tagging and printks */
265 char name
[8]; /* a name used for tagging and printks */
266 int max_blocks
; /* maximum number of blocks to be chained */
268 struct list_head list
; /* used for list of disciplines */
271 * Device recognition functions. check_device is used to verify
272 * the sense data and the information returned by read device
273 * characteristics. It returns 0 if the discipline can be used
274 * for the device in question. uncheck_device is called during
275 * device shutdown to deregister a device from its discipline.
277 int (*check_device
) (struct dasd_device
*);
278 void (*uncheck_device
) (struct dasd_device
*);
281 * do_analysis is used in the step from device state "basic" to
282 * state "accept". It returns 0 if the device can be made ready,
283 * it returns -EMEDIUMTYPE if the device can't be made ready or
284 * -EAGAIN if do_analysis started a ccw that needs to complete
285 * before the analysis may be repeated.
287 int (*do_analysis
) (struct dasd_block
*);
290 * Last things to do when a device is set online, and first things
291 * when it is set offline.
293 int (*ready_to_online
) (struct dasd_device
*);
294 int (*online_to_ready
) (struct dasd_device
*);
297 * Device operation functions. build_cp creates a ccw chain for
298 * a block device request, start_io starts the request and
299 * term_IO cancels it (e.g. in case of a timeout). format_device
300 * returns a ccw chain to be used to format the device.
301 * handle_terminated_request allows to examine a cqr and prepare
304 struct dasd_ccw_req
*(*build_cp
) (struct dasd_device
*,
307 int (*start_IO
) (struct dasd_ccw_req
*);
308 int (*term_IO
) (struct dasd_ccw_req
*);
309 void (*handle_terminated_request
) (struct dasd_ccw_req
*);
310 struct dasd_ccw_req
*(*format_device
) (struct dasd_device
*,
311 struct format_data_t
*);
312 int (*free_cp
) (struct dasd_ccw_req
*, struct request
*);
315 * Error recovery functions. examine_error() returns a value that
316 * indicates what to do for an error condition. If examine_error()
317 * returns 'dasd_era_recover' erp_action() is called to create a
318 * special error recovery ccw. erp_postaction() is called after
319 * an error recovery ccw has finished its execution. dump_sense
320 * is called for every error condition to print the sense data
323 dasd_erp_fn_t(*erp_action
) (struct dasd_ccw_req
*);
324 dasd_erp_fn_t(*erp_postaction
) (struct dasd_ccw_req
*);
325 void (*dump_sense
) (struct dasd_device
*, struct dasd_ccw_req
*,
327 void (*dump_sense_dbf
) (struct dasd_device
*, struct irb
*, char *);
329 void (*handle_unsolicited_interrupt
) (struct dasd_device
*,
332 /* i/o control functions. */
333 int (*fill_geometry
) (struct dasd_block
*, struct hd_geometry
*);
334 int (*fill_info
) (struct dasd_device
*, struct dasd_information2_t
*);
335 int (*ioctl
) (struct dasd_block
*, unsigned int, void __user
*);
337 /* suspend/resume functions */
338 int (*freeze
) (struct dasd_device
*);
339 int (*restore
) (struct dasd_device
*);
341 /* reload device after state change */
342 int (*reload
) (struct dasd_device
*);
344 int (*get_uid
) (struct dasd_device
*, struct dasd_uid
*);
347 extern struct dasd_discipline
*dasd_diag_discipline_pointer
;
350 * Notification numbers for extended error reporting notifications:
351 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
352 * eer pointer) is freed. The error reporting module needs to do all necessary
354 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
356 #define DASD_EER_DISABLE 0
357 #define DASD_EER_TRIGGER 1
359 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
360 #define DASD_EER_FATALERROR 1
361 #define DASD_EER_NOPATH 2
362 #define DASD_EER_STATECHANGE 3
363 #define DASD_EER_PPRCSUSPEND 4
366 /* Block device stuff. */
367 struct dasd_block
*block
;
369 unsigned int devindex
;
370 unsigned long flags
; /* per device flags */
371 unsigned short features
; /* copy of devmap-features (read-only!) */
373 /* extended error reporting stuff (eer) */
374 struct dasd_ccw_req
*eer_cqr
;
376 /* Device discipline stuff. */
377 struct dasd_discipline
*discipline
;
378 struct dasd_discipline
*base_discipline
;
381 /* Device state and target state. */
383 struct mutex state_mutex
;
384 int stopped
; /* device (ccw_device_start) was stopped */
386 /* reference count. */
389 /* ccw queue and memory for static ccw/erp buffers. */
390 struct list_head ccw_queue
;
394 struct list_head ccw_chunks
;
395 struct list_head erp_chunks
;
397 atomic_t tasklet_scheduled
;
398 struct tasklet_struct tasklet
;
399 struct work_struct kick_work
;
400 struct work_struct restore_device
;
401 struct work_struct reload_device
;
402 struct timer_list timer
;
404 debug_info_t
*debug_area
;
406 struct ccw_device
*cdev
;
408 /* hook for alias management */
409 struct list_head alias_list
;
411 /* default expiration time in s */
412 unsigned long default_expires
;
416 /* Block device stuff. */
418 struct request_queue
*request_queue
;
419 spinlock_t request_queue_lock
;
420 struct block_device
*bdev
;
423 unsigned long long blocks
; /* size of volume in blocks */
424 unsigned int bp_block
; /* bytes per block */
425 unsigned int s2b_shift
; /* log2 (bp_block/512) */
427 struct dasd_device
*base
;
428 struct list_head ccw_queue
;
429 spinlock_t queue_lock
;
431 atomic_t tasklet_scheduled
;
432 struct tasklet_struct tasklet
;
433 struct timer_list timer
;
435 #ifdef CONFIG_DASD_PROFILE
436 struct dasd_profile_info_t profile
;
442 /* reasons why device (ccw_device_start) was stopped */
443 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
444 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
445 #define DASD_STOPPED_PENDING 4 /* long busy */
446 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
447 #define DASD_STOPPED_SU 16 /* summary unit check handling */
448 #define DASD_STOPPED_PM 32 /* pm state transition */
449 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */
451 /* per device flags */
452 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
453 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
454 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
455 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
456 * confuse this with the user specified
460 void dasd_put_device_wake(struct dasd_device
*);
463 * Reference count inliners
466 dasd_get_device(struct dasd_device
*device
)
468 atomic_inc(&device
->ref_count
);
472 dasd_put_device(struct dasd_device
*device
)
474 if (atomic_dec_return(&device
->ref_count
) == 0)
475 dasd_put_device_wake(device
);
479 * The static memory in ccw_mem and erp_mem is managed by a sorted
480 * list of free memory chunks.
484 struct list_head list
;
486 } __attribute__ ((aligned(8)));
489 dasd_init_chunklist(struct list_head
*chunk_list
, void *mem
,
492 struct dasd_mchunk
*chunk
;
494 INIT_LIST_HEAD(chunk_list
);
495 chunk
= (struct dasd_mchunk
*) mem
;
496 chunk
->size
= size
- sizeof(struct dasd_mchunk
);
497 list_add(&chunk
->list
, chunk_list
);
501 dasd_alloc_chunk(struct list_head
*chunk_list
, unsigned long size
)
503 struct dasd_mchunk
*chunk
, *tmp
;
505 size
= (size
+ 7L) & -8L;
506 list_for_each_entry(chunk
, chunk_list
, list
) {
507 if (chunk
->size
< size
)
509 if (chunk
->size
> size
+ sizeof(struct dasd_mchunk
)) {
510 char *endaddr
= (char *) (chunk
+ 1) + chunk
->size
;
511 tmp
= (struct dasd_mchunk
*) (endaddr
- size
) - 1;
513 chunk
->size
-= size
+ sizeof(struct dasd_mchunk
);
516 list_del(&chunk
->list
);
517 return (void *) (chunk
+ 1);
523 dasd_free_chunk(struct list_head
*chunk_list
, void *mem
)
525 struct dasd_mchunk
*chunk
, *tmp
;
526 struct list_head
*p
, *left
;
528 chunk
= (struct dasd_mchunk
*)
529 ((char *) mem
- sizeof(struct dasd_mchunk
));
530 /* Find out the left neighbour in chunk_list. */
532 list_for_each(p
, chunk_list
) {
533 if (list_entry(p
, struct dasd_mchunk
, list
) > chunk
)
537 /* Try to merge with right neighbour = next element from left. */
538 if (left
->next
!= chunk_list
) {
539 tmp
= list_entry(left
->next
, struct dasd_mchunk
, list
);
540 if ((char *) (chunk
+ 1) + chunk
->size
== (char *) tmp
) {
541 list_del(&tmp
->list
);
542 chunk
->size
+= tmp
->size
+ sizeof(struct dasd_mchunk
);
545 /* Try to merge with left neighbour. */
546 if (left
!= chunk_list
) {
547 tmp
= list_entry(left
, struct dasd_mchunk
, list
);
548 if ((char *) (tmp
+ 1) + tmp
->size
== (char *) chunk
) {
549 tmp
->size
+= chunk
->size
+ sizeof(struct dasd_mchunk
);
553 __list_add(&chunk
->list
, left
, left
->next
);
557 * Check if bsize is in { 512, 1024, 2048, 4096 }
560 dasd_check_blocksize(int bsize
)
562 if (bsize
< 512 || bsize
> 4096 || !is_power_of_2(bsize
))
567 /* externals in dasd.c */
568 #define DASD_PROFILE_ON 1
569 #define DASD_PROFILE_OFF 0
571 extern debug_info_t
*dasd_debug_area
;
572 extern struct dasd_profile_info_t dasd_global_profile
;
573 extern unsigned int dasd_profile_level
;
574 extern const struct block_device_operations dasd_device_operations
;
576 extern struct kmem_cache
*dasd_page_cache
;
578 struct dasd_ccw_req
*
579 dasd_kmalloc_request(int , int, int, struct dasd_device
*);
580 struct dasd_ccw_req
*
581 dasd_smalloc_request(int , int, int, struct dasd_device
*);
582 void dasd_kfree_request(struct dasd_ccw_req
*, struct dasd_device
*);
583 void dasd_sfree_request(struct dasd_ccw_req
*, struct dasd_device
*);
586 dasd_kmalloc_set_cda(struct ccw1
*ccw
, void *cda
, struct dasd_device
*device
)
588 return set_normalized_cda(ccw
, cda
);
591 struct dasd_device
*dasd_alloc_device(void);
592 void dasd_free_device(struct dasd_device
*);
594 struct dasd_block
*dasd_alloc_block(void);
595 void dasd_free_block(struct dasd_block
*);
597 void dasd_enable_device(struct dasd_device
*);
598 void dasd_set_target_state(struct dasd_device
*, int);
599 void dasd_kick_device(struct dasd_device
*);
600 void dasd_restore_device(struct dasd_device
*);
601 void dasd_reload_device(struct dasd_device
*);
603 void dasd_add_request_head(struct dasd_ccw_req
*);
604 void dasd_add_request_tail(struct dasd_ccw_req
*);
605 int dasd_start_IO(struct dasd_ccw_req
*);
606 int dasd_term_IO(struct dasd_ccw_req
*);
607 void dasd_schedule_device_bh(struct dasd_device
*);
608 void dasd_schedule_block_bh(struct dasd_block
*);
609 int dasd_sleep_on(struct dasd_ccw_req
*);
610 int dasd_sleep_on_immediatly(struct dasd_ccw_req
*);
611 int dasd_sleep_on_interruptible(struct dasd_ccw_req
*);
612 void dasd_device_set_timer(struct dasd_device
*, int);
613 void dasd_device_clear_timer(struct dasd_device
*);
614 void dasd_block_set_timer(struct dasd_block
*, int);
615 void dasd_block_clear_timer(struct dasd_block
*);
616 int dasd_cancel_req(struct dasd_ccw_req
*);
617 int dasd_flush_device_queue(struct dasd_device
*);
618 int dasd_generic_probe (struct ccw_device
*, struct dasd_discipline
*);
619 void dasd_generic_remove (struct ccw_device
*cdev
);
620 int dasd_generic_set_online(struct ccw_device
*, struct dasd_discipline
*);
621 int dasd_generic_set_offline (struct ccw_device
*cdev
);
622 int dasd_generic_notify(struct ccw_device
*, int);
623 void dasd_generic_handle_state_change(struct dasd_device
*);
624 int dasd_generic_pm_freeze(struct ccw_device
*);
625 int dasd_generic_restore_device(struct ccw_device
*);
626 enum uc_todo
dasd_generic_uc_handler(struct ccw_device
*, struct irb
*);
628 int dasd_generic_read_dev_chars(struct dasd_device
*, int, void *, int);
629 char *dasd_get_sense(struct irb
*);
631 void dasd_device_set_stop_bits(struct dasd_device
*, int);
632 void dasd_device_remove_stop_bits(struct dasd_device
*, int);
634 int dasd_device_is_ro(struct dasd_device
*);
637 /* externals in dasd_devmap.c */
638 extern int dasd_max_devindex
;
639 extern int dasd_probeonly
;
640 extern int dasd_autodetect
;
641 extern int dasd_nopav
;
642 extern int dasd_nofcx
;
644 int dasd_devmap_init(void);
645 void dasd_devmap_exit(void);
647 struct dasd_device
*dasd_create_device(struct ccw_device
*);
648 void dasd_delete_device(struct dasd_device
*);
650 int dasd_get_feature(struct ccw_device
*, int);
651 int dasd_set_feature(struct ccw_device
*, int, int);
653 int dasd_add_sysfs_files(struct ccw_device
*);
654 void dasd_remove_sysfs_files(struct ccw_device
*);
656 struct dasd_device
*dasd_device_from_cdev(struct ccw_device
*);
657 struct dasd_device
*dasd_device_from_cdev_locked(struct ccw_device
*);
658 struct dasd_device
*dasd_device_from_devindex(int);
660 int dasd_parse(void);
661 int dasd_busid_known(const char *);
663 /* externals in dasd_gendisk.c */
664 int dasd_gendisk_init(void);
665 void dasd_gendisk_exit(void);
666 int dasd_gendisk_alloc(struct dasd_block
*);
667 void dasd_gendisk_free(struct dasd_block
*);
668 int dasd_scan_partitions(struct dasd_block
*);
669 void dasd_destroy_partitions(struct dasd_block
*);
671 /* externals in dasd_ioctl.c */
672 int dasd_ioctl(struct block_device
*, fmode_t
, unsigned int, unsigned long);
674 /* externals in dasd_proc.c */
675 int dasd_proc_init(void);
676 void dasd_proc_exit(void);
678 /* externals in dasd_erp.c */
679 struct dasd_ccw_req
*dasd_default_erp_action(struct dasd_ccw_req
*);
680 struct dasd_ccw_req
*dasd_default_erp_postaction(struct dasd_ccw_req
*);
681 struct dasd_ccw_req
*dasd_alloc_erp_request(char *, int, int,
682 struct dasd_device
*);
683 void dasd_free_erp_request(struct dasd_ccw_req
*, struct dasd_device
*);
684 void dasd_log_sense(struct dasd_ccw_req
*, struct irb
*);
685 void dasd_log_sense_dbf(struct dasd_ccw_req
*cqr
, struct irb
*irb
);
687 /* externals in dasd_3990_erp.c */
688 struct dasd_ccw_req
*dasd_3990_erp_action(struct dasd_ccw_req
*);
689 void dasd_3990_erp_handle_sim(struct dasd_device
*, char *);
691 /* externals in dasd_eer.c */
692 #ifdef CONFIG_DASD_EER
693 int dasd_eer_init(void);
694 void dasd_eer_exit(void);
695 int dasd_eer_enable(struct dasd_device
*);
696 void dasd_eer_disable(struct dasd_device
*);
697 void dasd_eer_write(struct dasd_device
*, struct dasd_ccw_req
*cqr
,
699 void dasd_eer_snss(struct dasd_device
*);
701 static inline int dasd_eer_enabled(struct dasd_device
*device
)
703 return device
->eer_cqr
!= NULL
;
706 #define dasd_eer_init() (0)
707 #define dasd_eer_exit() do { } while (0)
708 #define dasd_eer_enable(d) (0)
709 #define dasd_eer_disable(d) do { } while (0)
710 #define dasd_eer_write(d,c,i) do { } while (0)
711 #define dasd_eer_snss(d) do { } while (0)
712 #define dasd_eer_enabled(d) (0)
713 #endif /* CONFIG_DASD_ERR */
715 #endif /* __KERNEL__ */